(Just including the graph for reference. I'm not sure it helps with proper description or the answer the teacher was asking for, but you can see that from one direction it goes negative as you approach 8 and from the other it goes to positive infinity.)

save

path: 0 22017380 22018257, hotness: undefined, score: 28, children: 0

JustAPenguin 13 points 4 months ago

I have a BA in Mathematics. The limit is indeed determined by the direction you approach the limiting value.

When given without specification, the limit is implied to come from the left, meaning it increases towards the limiting value, which is why you see +inf.

save

path: 0 22017380 22018069, hotness: undefined, score: 13, children: 7

rooroo 16 points 4 months ago

Yeah but then it should be negative infinite, cause if x<8 the fraction is negative.

save

path: 0 22017380 22018069 22018165, hotness: undefined, score: 16, children: 2

JustAPenguin 12 points 4 months ago

Ah, I misread the - as a +. You're correct! Sorry, I just woke up and am in the middle of my morning doomscrolling sesh

save

path: 0 22017380 22018069 22018165 22018198, hotness: undefined, score: 12, children: 1

deadbeef79000 5 points 4 months ago

Conveniently modeled with the same limit.

Though I'm not sure what negative doom is and what happens when it approaches infinity.

save

path: 0 22017380 22018069 22018165 22018198 22019204, hotness: undefined, score: 5, children: 0

carmo55 6 points 4 months ago

This is just not true. The normal limit we have here means a limit would have to exist from both directions and they should be equal. They're not, so the limit doesn't exist.

One-sided limits would be denoted by x -> 5– and x -> 5+ or similar.

PS: in complex analysis, there is no distinction between +infty and -infty, so there it would be correct to say the function has limit infty at 5.

save

path: 0 22017380 22018069 22022604, hotness: undefined, score: 6, children: 3

Ephera 4 points 4 months ago

In my experience with maths, there's a whole bunch of different conventions all over the place, so it might've genuinely been how they were taught, even if you were taught differently...

save

path: 0 22017380 22018069 22022604 22023146, hotness: undefined, score: 4, children: 1

cows_are_underrated 3 points 4 months ago

Yeah, that's my experience too. When we did this in school we always defined from which side we were approaching the function.

save

path: 0 22017380 22018069 22022604 22023146 22023297, hotness: undefined, score: 3, children: 0

JustAPenguin 1 point 4 months ago

You're right. But in this case, which is the case I was referring to, there is no two sided limit. It is discontinuous. It is in this case which I was referring to. Sorry for not being clear.

save

path: 0 22017380 22018069 22022604 22033932, hotness: undefined, score: 1, children: 0

Ooops 12 points 4 months ago

It should be +/-∞

Minus or plus depending on the side from which you approach the limes.

save

path: 0 22017380 22020787, hotness: undefined, score: 12, children: 1

Test_Tickles 5 points 4 months ago

Infinity limes? After all these years, this meme starts to make sense: Limes

save

path: 0 22017380 22020787 22026664, hotness: undefined, score: 5, children: 0

Prunebutt 35 points 4 months ago

Just here to comment on the weird spreadsheet format (of that oooooold joke)

save

path: 0 22017435, hotness: undefined, score: 35, children: 5

deadbeef79000 8 points 4 months ago

I took a screenshot and put it in a word doc and embedded that in a excel sheet and sent it in an email...

"Endorsed for MS Office" on LinkedIn.

save

path: 0 22017435 22019234, hotness: undefined, score: 8, children: 1

18107 3 points 4 months ago

That just sounds like a .norm file

save

path: 0 22017435 22019234 22020281, hotness: undefined, score: 3, children: 0

protogen420 3 points 4 months ago

also weird looking text, overshapen

save

path: 0 22017435 22017610, hotness: undefined, score: 3, children: 2

blackbrook 1 point 4 months ago

Like an AI's idea of what a font looks like.

save

path: 0 22017435 22017610 22020565, hotness: undefined, score: 1, children: 1

bombadil 2 points 4 months ago

Don't think so. It looks weird, but very consistently. Look at the kerning, the spacing after each "e" is just a little too wide, and all the "e"s have the same little hump at the top.

I would guess this is a mild anti-dyslexia font or sth like that.

save

path: 0 22017435 22017610 22020565 22020853, hotness: undefined, score: 2, children: 0

FiskFisk33 30 points 4 months ago

That is not infinity, its undefined.

This only works if you use a one sided limit.

save

path: 0 22022881, hotness: undefined, score: 30, children: 1

Leesi 3 points 4 months ago

or the domain is the projectively extended real line! (obv not the case here ofc)

save

path: 0 22022881 22034029, hotness: undefined, score: 3, children: 0

mercano 27 points 4 months ago

That’s a ChatGPT kind of answer. A pattern is recognized, but the meaning isn’t understood.

save

path: 0 22020202, hotness: undefined, score: 27, children: 5

chicken 22 points 4 months ago

There's no way ChatGPT would be creative enough to put a number on its side

save

path: 0 22020202 22022288, hotness: undefined, score: 22, children: 3

AlecSadler 16 points 4 months ago

ChatGPT is such garbage.

edit: The people down voting me clearly are bots or GPT fanbois. In AI circles nobody thinks ChatGPT is good.

save

path: 0 22020202 22022288 22023190, hotness: undefined, score: 16, children: 2

bunchberry 2 points 4 months ago

ChatGPT just gives the correct answer that the limit doesn't exist.

save

path: 0 22020202 22022288 22023190 22023395, hotness: undefined, score: 2, children: 0

SeptugenarianSenate 0 points 4 months ago

claude is gaud

save

path: 0 22020202 22022288 22023190 22034168, hotness: undefined, score: 0, children: 0

Peppycito 2 points 4 months ago

Rote learning isn't new and is still quite popular.

save

path: 0 22020202 22021448, hotness: undefined, score: 2, children: 0

jjj 13 points 4 months ago

The first one is incorrect, the limit doesn't exist unless you specify whether you're coming from the left or right.

On another note, I think their student has invented a new symbol for "Does Not Exist".

save

path: 0 22017508, hotness: undefined, score: 13, children: 0

n0respect 12 points 4 months ago

the Cheat is to the limit

save

path: 0 22019178, hotness: undefined, score: 12, children: 1

LastYearsIrritant 6 points 4 months ago

Everybody Fhqwhgads

save

path: 0 22019178 22019465, hotness: undefined, score: 6, children: 0

webghost0101 4 points 4 months ago

Story time, third grader me would have done this no questions about it.

Having to solve multiplication and recently had learned the table of 9 trick i was looking if there where other tricks I could find.

The first one was number x10 and what i observed is that if you do times ten. You take the number. And you put 1 “0” behind it.

Interesting…. I thought

But the next one multiplied with a single digit so how could i apply that theory.

Simple. 1+0 is 1, which is a single digit so if you multiply by 10, you actually multiply by 1+0 which means you put 1 zeros behind it

Multiple by 2 is short for multiply By 2+0, put 2 zeros behind it

Multiply by 9, put 9 zeros behind it.

I definitely knew this is not what we had learned, and knew there was a “chance” i was going to fail all of these, i also even knew some of the actual answers however i also believed there was a chance that i found an alternative equally good solution, and I consciously decided to take that risk because I wanted to know if i was right. Maybe I discovered something new

My teacher was not happy to say the least, and in that (actual) furry did treat me unfair and it still bothers me. Because i got a zero for the assignment.. while i was very certain that the 2 occurrences of x10 did have the appropriate solution.

save

path: 0 22017931, hotness: undefined, score: 4, children: 0

TheLeadenSea 2 points 4 months ago

Specification gaming lol

save

path: 0 22018170, hotness: undefined, score: 2, children: 0

Kolanaki 2 points 4 months ago

This is why we need quantum computing. Traditional computing doesn't account for sideways numbers.

save

path: 0 22020802, hotness: undefined, score: 2, children: 0

Dojan 2 points 4 months ago

lim means glue in Swedish.